40-km OFDR-Based Distributed Disturbance Optical Fiber Sensor

We present a 40-km distributed disturbance optical fiber sensor based on optical frequency domain reflectometry. Using the local Rayleigh backscattering in the optical frequency domain after deskew filter processing, we can extract the position and level information of the disturbance by the cross-correlation analysis of the signals between the disturbed and nondisturbed states. We also realize the location of two simultaneous disturbances in the test fiber.